unpacked-list-comprehension (UP027)

Derived from the pyupgrade linter.

Fix is always available.

What it does

Checks for list comprehensions that are immediately unpacked.

Why is this bad?

There is no reason to use a list comprehension if the result is immediately unpacked. Instead, use a generator expression, which is more efficient as it avoids allocating an intermediary list.

Example

a, b, c = [foo(x) for x in items]

Use instead:

a, b, c = (foo(x) for x in items)

References

• Python documentation: Generator expressions
• Python documentation: List comprehensions